DOI: 10.36347/sjds.2016.v03i03.004

Pages: 88-94

Abstract: The objective of this in vitro study was to assess the accuracy of marginal fit and marginal micro leakage of copings obtained from laser metal sintering technique and conventional casting technique. Thirty maxillary premolars extracted for orthodontic purposes were used in the study. They were divided into two groups and disinfected with 5.2% sodium hypochlorite solution. Teeth were prepared using torpedo bur to provide a chamfer finish line; care was taken to maintain a constant taper of the preparation. Marginal misfit was evaluated using a light microscope. The samples were luted using Type I Glass Ionomer cement and immersed in a solution of methylene blue 2% solution for 24 hours. The samples were then sectioned and analysed. The marginal misfit of the copings fabricated using conventional casting and laser metal sintering were 90.60 and 90.0 respectively. Marginal microleakage was scored and 73% of the samples in the lost wax method obtained a score of 0 and 1 whereas 73.3% samples in the DMLS technique obtained a score of 0 and 26.7% obtained a score of 1. 26.7% of the samples in the lost wax technique were observed to give a score of 2 and 3 while none of the samples in the DMLS technique provided those scores. The result was statistically significant. Marginal misfit values were similar for both groups and so the result was not statistically significant. Copings fabricated via the lost wax technique showed higher marginal microleakage values than those in the laser sintered technique.